The word "upperclass" refers to a group of people who are deemed to be of higher social status or rank. Antonyms for this word can include terms such as "lower class," "working class," "middle class," and "underprivileged." These terms denote various groups of people who may not have the same social and economic advantages as those who are considered upperclass. The use of these antonyms highlights the significant inequalities that exist within society, and they serve as a reminder that people can be divided into different social groups based on factors such as income, education, race, and gender.